chore: ratatui 0.30 maintenance + collaboration baseline (#1)

.github/dependabot.yml

@@ -0,0 +1,16 @@
+version: 2
+updates:
+  - package-ecosystem: cargo
+    directory: "/"
+    schedule:
+      interval: weekly
+    open-pull-requests-limit: 10
+    groups:
+      patch-and-minor:
+        update-types:
+          - patch
+          - minor
+  - package-ecosystem: github-actions
+    directory: "/"
+    schedule:
+      interval: weekly